"use strict";
const path = require("path");
const defaultSettings = require("./src/settings.js");

function resolve(dir) {
    return path.join(__dirname, dir);
}

const name = defaultSettings.title || "vue Element Admin"; // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following method:
// port = 9527 npm run dev OR npm run dev --port = 9527
const port = process.env.port || process.env.npm_config_port || 9527; // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
    /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
    publicPath: "/",
    outputDir: "dist",
    assetsDir: "static",
    lintOnSave: process.env.NODE_ENV === "development",
    productionSourceMap: false,
    devServer: {
        port: port,
        open: true,
        overlay: {
            warnings: false,
            errors: true
        },
        before: require("./mock/mock-server.js")
    },
    configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
        name: name,
        resolve: {
            alias: {
                "@": resolve("src")
            }
        }
    },
    chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    // it can improve the speed of the first screen, it is recommended to turn on preload
        config.plugin("preload").tap(() => [
            {
                rel: "preload",
                // to ignore runtime.js
                // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
                fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
                include: "initial"
            }
        ]);

        // when there are many pages, it will cause too many meaningless requests
        config.plugins.delete("prefetch");

        // set svg-sprite-loader
        config.module
            .rule("svg")
            .exclude.add(resolve("src/icons"))
            .end();
        config.module
            .rule("icons")
            .test(/\.svg$/)
            .include.add(resolve("src/icons"))
            .end()
            .use("svg-sprite-loader")
            .loader("svg-sprite-loader")
            .options({
                symbolId: "icon-[name]"
            })
            .end();

        config
            .when(process.env.NODE_ENV !== "development",
                config => {
                    config
                        .plugin("ScriptExtHtmlWebpackPlugin")
                        .after("html")
                        .use("script-ext-html-webpack-plugin", [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /runtime\..*\.js$/
                        }])
                        .end();
                    config
                        .optimization.splitChunks({
                            chunks: "all",
                            cacheGroups: {
                                libs: {
                                    name: "chunk-libs",
                                    test: /[\\/]node_modules[\\/]/,
                                    priority: 10,
                                    chunks: "initial" // only package third parties that are initially dependent
                                },
                                elementUI: {
                                    name: "chunk-elementUI", // split elementUI into a single package
                                    priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                                },
                                commons: {
                                    name: "chunk-commons",
                                    test: resolve("src/components"), // can customize your rules
                                    minChunks: 3, //  minimum common number
                                    priority: 5,
                                    reuseExistingChunk: true
                                }
                            }
                        });
                    // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
                    config.optimization.runtimeChunk("single");
                }
            );
    }
};
